Article of footwear

1. An article of footwear comprising:

a shoe body including a shoe upper and a sole including a bendable portion which together define a first cavity;

said sole comprising a second cavity;

at least one pump positioned in the second cavity;

an actuation member comprising a first end and a second end opposite the first end, and the actuation member positioned inside said sole;

the actuation member comprising a rotation region at which the second end of the actuation member is rotated relative to the first end of the actuation member; and

the second end of the actuation member is a movable free end with respect to the first end and actuates the pump member by pressing or pulling against said pump member within the second cavity in response to bending or unbending of said sole.

2. The article of footwear as claimed in claim 1 , wherein said sole includes:

a front portion;

a mid portion;

a rear portion;

said sole configured to bend at or near said mid portion in response to or during walking motion and said actuation member includes a front segment residing in said front portion and a rear segment residing in said rear portion,

wherein said rotation region connects said front segment and said rear segment.

3. The article of footwear as claimed in claim 2 , wherein said sole comprises an insole and an outsole and said pump resides between said insole and said outsole at or near said rear portion.

4. The article of footwear as claimed in claim 2 , wherein said sole comprises an insole and an outsole and said pump resides between said insole and said outsole at or near said front portion.

5. The article of footwear as claimed in claim 1 , wherein said pump includes a front region and a rear region, and wherein said front region is substantially thinner than said rear region.

6. The article of footwear as claimed in claim 1 , wherein said pump is provided with air passageways and valves in communication with the first cavity and/or the surroundings of said footwear article.

7. The article of footwear as claimed in claim 1 , wherein said pump is enclosed in an airtight chamber arranged in said sole and wherein said chamber is provided with air passageways and control valves in communication with the first cavity and/or surroundings of said footwear article.

8. The article of footwear as claimed in claim 1 , wherein said sole comprises an insole and an outsole and said pump resides between said insole and said outsole at or near said rotation region.

9. The article of footwear in claim 8 comprising two said pumps, one of which is located above the free end of said actuation member and the said other pump is located below the free end of said actuation member.

10. The article of footwear as claimed in claim 1 , wherein said rotation region of the actuation member includes a spring, a springboard or a rigid board for urging the actuation member toward the pump.

11. The article of footwear as claimed in claim 1 , wherein said footwear article comprises a control valve connected to a passageway of said pump for controlling the ratio of the amount of air receivable from the first cavity and the amount of air receivable from surroundings of said footwear article.

12. The article of footwear as claimed in claim 1 , further comprising a chamber for accommodating a temperature-regulating or substance dispensing member, wherein said chamber is connected to the first and/or second cavity.

13. The article of footwear as claimed in claim 12 , further comprising a temperature-regulating or substance dispensing member.

14. The article of footwear as claimed in claim 1 , wherein said sole includes an insole and an outsole together defining said second cavity therebetween and having a front portion and a rear portion, with said pump residing in said rear portion, and

wherein said sole is made of relatively rigid material whereby in use the relative distance between said insole and said outsole at said rear portion remains essentially constant during movement of air into and/or out of the cavity.